    // 监听scroll事件
    window.addEventListener('scroll', function () {
        var t = $('body, html').scrollTop();   // 目前监听的是整个body的滚动条距离
        if (t > 48) {
            $('.my-nav').addClass('my-nav-active')
        } else {
            $('.my-nav').removeClass('my-nav-active')
        }
    })

    // 日期格式化
    Date.prototype.Format = function(fmt) {
        var o = {
            "M+" : this.getMonth() + 1,
            "d+" : this.getDate(),
            "h+" : this.getHours(),
            "m+" : this.getMinutes(),
            "s+" : this.getSeconds(),
            "q+" : Math.floor((this.getMonth() + 3) / 3),
            "S" : this.getMilliseconds()
        };
        if (/(y+)/.test(fmt))
            fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
        for (var k in o)
            if (new RegExp("(" + k + ")").test(fmt))
                fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
        return fmt;
    }

    // JS函数用于获取url参数:
    function getQueryVariable(variable) {
        var query = window.location.search.substring(1);
        var vars = query.split("&");
        for (var i = 0; i < vars.length; i++) {
            var pair = vars[i].split("=");
            if (pair[0] == variable) { return pair[1]; }
        }
        return (false);
    }
